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See also: Appendix:Variations of "os"
- (countable, computing) Initialism of operating system.
- (calendar systems) Abbreviation of Old Style.
- (eyewear) Initialism of O.S. (“oculus sinister”).; (the left eye from the patient's point of view) (in eyeglass and contact lens prescriptions)
- (eyewear): O.D.
- (Can we verify(+) this sense?) (eyewear) O.S. (“oculus sinister”) (the left eye from the patient's point of view)